فهرست مطالب سیاوش صلحی اندراب

In order to determine the heritability and genetic parameters of physiological traits related to salinity stress in barley (Hordeum vulgare L.), a 7×7 half diallel cross was conducted at Islamic Azad University, Ardabil, during 2016-2017. The F1 seeds along with their parents were grown in greenhouse under non-stress, 8 and 12 dS/m salinity stress levels. After exposure of plants to salinity, leaf chlorophyll content, chlorophyll fluorescence and stomatal conductance were measured. Narrow sense heritability of chlorophyll content ranged from 0.29 to 0.40. These values for chlorophyll fluorescence ranged from 0.16 to 0.24 and for stomatal conductance ranged from 0.26 to 0.54. Broad sense heritability of traits was high and ranged from 0.70 to 0.87. The degree of average dominance was higher than one in all of traits, indicating the presence of over dominance in control of the traits. Dominant alleles were favorable, in stomatal conductance however such relation was not observed in leaf chlorophyll content and chlorophyll fluorescence

In order to determine the heritability and genetic parameters of yield and yield components under salinity stress in barley, a crossing 7×7 one-way diallel was conducted during 2016 – 2017 in Islamic Azad University, Ardabil, Iran. The F1 seeds alongwith their parents were grown in a greenhouse experiment under non-stress (control) and salinity stresses of 8 and 12 ds/m. In this research, yield and some morphological and agronomic traits were measured. The results of the goodness of fit indicate the adequacy of additive-dominant model for all of the traits. Results showed that all traits had high broad sense heritability, suggesting the usefulness of the traits under study in selection of salinity stress of barley. The results of the experiment showed that the average degree of dominance in all salinity levels was greater than one, so the above traits were controlled by the over-dominance. Results showed that for plant height, dominant alleles and for grain yield and 100 kernels weight, recessive alleles are favorable. Non-significant GCA source of variation in Grifting's method in most of the traits, confirmed the contribution of dominance effects. The narrow sense heritability of traits was low, suggesting that selection for these traits should be delayed until after some homozygosity was achieved. Based on the narrow sense heritability, it was concluded that, under moderate salinity (8ds/m) spike weight, number of seeds/spike and plant yield and under sever salinity (12ds/m) spike weight, number of fertile tillers and plant yield can be regarded as favorable criteria for selection of salinity tolerance in barley.